Quantum Shield

Post-quantum asset protection protocol for Ethereum using NIST-standardized cryptography

Live Demo

	URL
Frontend	https://quantum-shield.xyz
Backend API	https://quantum-shield-production-8f2b.up.railway.app/v1/health
Network	Ethereum Sepolia (testnet)

Quick Links

What is Quantum Shield?

Quantum Shield protects smart contract assets against quantum computing threats using NIST FIPS 204 (ML-DSA/Dilithium) and FIPS 205 (SLH-DSA/SPHINCS+) dual post-quantum signatures, combined with a decentralized Prover Pool, VRF-based selection, and time-locked custody.

Key Features

Dual PQC Signatures — ML-DSA-65 + SLH-DSA for defense-in-depth
Prover Pool — Decentralized verification with stake-weighted selection via VRF
Time-Locked Custody — 24h normal unlock, 7-day emergency path with bond
Observer Network — Independent challenge system with quadratic slashing
On-Chain Governance — veQS token voting, security council, insurance fund
11 Sub-Applications — Consumer, Prover, Observer, Explorer, Enterprise, Governance, Admin

Architecture

Code

┌─────────────────────────────────────────────────────────────────┐
│  Frontend (Next.js 15)         11 apps, 136 routes, ja/en i18n │
├─────────────────────────────────────────────────────────────────┤
│  Backend API (Rust/Axum)       REST API, SIWE auth, Auto-Claim │
├──────────────────┬──────────────────────────────────────────────┤
│  L1: Sepolia     │  L3: Arbitrum Sepolia                       │
│  • Vault         │  • CoreLayer    • Governor                  │
│  • ProverRegistry│  • veQS         • RewardRouter              │
│  • SPHINCS+ Vfy  │  • QSToken      • InsuranceFund             │
└──────────────────┴──────────────────────────────────────────────┘

9 Core Sequences

#	Flow	Path
1	Consumer Lock	Frontend → API → DB → L1 Vault
2	Normal Unlock	24h timelock → Prover verification → L1 claim
3	Emergency Unlock	Bond deposit → 7-day lock → Emergency path
4	Prover Registration	Stake → VRF selection → Proof generation
5	Observer Challenge	Monitor → Challenge → VRF arbitration
6	Slashing	Quadratic penalty → L1 ProverRegistry
7	Governance	veQS voting → Proposal execution on L3
8	Emergency Pause	Security council → L1 pause
9	Token Hub	Stake QS → veQS → Rewards

Tech Stack

Layer	Technology
Frontend	Next.js 15, TypeScript, Tailwind CSS, Wagmi, RainbowKit
Backend	Rust, Axum, PostgreSQL, Redis, RabbitMQ
Contracts	Solidity 0.8.24 (Foundry), deployed to Sepolia + Arbitrum Sepolia
Cryptography	NIST FIPS 204 (ML-DSA-65), FIPS 205 (SLH-DSA), SHA3-256
SDK	WASM (Rust → wasm-pack), npm-publishable
Testing	Playwright (E2E), Vitest, cargo test, Foundry forge test

Deployed Contracts

L1: Ethereum Sepolia

Contract	Address
Vault	`0x07012aeF87C6E423c32F2f8eaF81762f63337260`
ProverRegistry	`0x08e1fc1A0d614bc132B48950760c7A291cCB8946`
SPHINCS+ Verifier	`0xD090b5A627d9bd6D96a8b5f6F504ebCa79980103`

L3: Arbitrum Sepolia (12 contracts)

Contract	Address
CoreLayer	`0xb04F4DFe093dC80420117EDC8300f5EB6F6EDBf0`
veQS	`0xE72dFa97C9E452dC0b8E6aa026c910D21B20fCAE`
Governor	`0xe93b8129DC3dBD48E5d78C5A4C156DD1BFa8D65B`
QSToken	`0xBD66beBE19E664dF143da54808d746192e4f2ee2`

All L3 contracts verified on Sourcify.

Quick Start

Prerequisites

Docker & Docker Compose
Rust 1.75+ with cargo
Node.js 20+ with pnpm
Foundry (forge, anvil)

Development Setup

bash

# 1. Start infrastructure
docker compose up -d postgres redis rabbitmq l3-node minio minio-init

# 2. Run database migrations
cd src/api/api
DATABASE_URL="postgresql://quantum:quantum_dev@localhost:5432/quantum_shield" sqlx migrate run

# 3. Start backend API (port 8080)
cargo run --bin api-server

# 4. Start frontend (port 3000)
cd src/frontend/web
pnpm install
pnpm dev

Verify

Terminal

curl http://localhost:8080/v1/health
# {"status":"healthy"}

Project Structure

Code

quantum-shield/
├── src/
│   ├── api/api/              # Rust/Axum backend
│   │   ├── src/routes/       # API route handlers
│   │   ├── src/services/     # Business logic
│   │   ├── migrations/       # PostgreSQL migrations (17 files)
│   │   └── config/           # YAML configuration
│   ├── frontend/web/         # Next.js 15 frontend
│   │   ├── src/app/          # App Router pages (11 apps)
│   │   ├── src/components/   # 300+ React components
│   │   ├── src/hooks/        # React Query hooks per app
│   │   └── locales/          # ja/en translations
│   ├── l1/contracts/         # L1 Solidity contracts (Foundry)
│   ├── l3/                   # L3 governance contracts
│   └── frontend/sdk/wasm/    # WASM SDK (Dilithium + SPHINCS+)
├── docs/
│   ├── core/SEQUENCES.md     # 9 core sequence specifications
│   ├── ACTUAL_STATE.md       # Current implementation state
│   └── pitch/                # Pitch deck, grant applications
├── docker-compose.yml        # Development infrastructure
└── .github/workflows/        # CI/CD pipelines

Testing

bash

# Backend
cd src/api/api && cargo test

# Frontend E2E
cd src/frontend/web && npx playwright test

# Smart Contracts
cd src/l1/contracts && forge test

Test Coverage: 137 E2E tests passing, 107 integration tests, 0 failures.

Security

Cryptography: NIST FIPS 204 ML-DSA-65 + FIPS 205 SLH-DSA (post-quantum)
Hashing: SHA3-256 (no keccak256 in application layer)
Authentication: SIWE (Sign-In with Ethereum) + JWT
Time Locks: 24h normal, 7-day emergency with bond collateral
Slashing: Quadratic penalty for malicious provers

Audit Status

Internal code review
External audit (planned)

License

This project is licensed under the MIT License. See LICENSE for details.

Built for a post-quantum future.